I have frequent questions on the size and suitability for setting up western electric stereo horn configurations. I can only reply based on experience and actual fittings into my room. This room is approx 6,50 x 7 metres and see here how the different horns fill the room. The length of the wall between the two doors is 3m25.

In order :

We13a
We12a
We22a
We15a

Hope this helps.

All fun…